Well it’s easy to assume that big companies do the work you’d expect. But I think the bigger the team, the less they care about all aspects.

Especially with A/B tests, because they are just temporarily

Curiously, they've also had that issue and wrote a dedicated tool to clean up unreachable code after old A/B tests:

https://www.infoq.com/news/2020/04/uber-piranha-unreachable-...

I also know it first-hand as just last week I've been doing a mega-cleanup of years-old A/B test flags in our own code.

tbh I'm actually surprised that the executables / code takes up so much space at all. I'm sure the executable has some embedded resources in as well, but 130mb for just the executable is quite a lot imo.